Requirements for the use of different types of microphones

The requirements for the use of different pointing types of microphones are as follows:

1. The use of omnidirectional microphone: When there is no fixed direction between the sound source and the microphone, and the sensitivity of the microphone in all directions is required to be the same, then only the sound of the microphone Just open a hole in the housing before the hole. Such as phone handles, cell phones, hands-free headsets and so on.

2. The use of one-way microphone: when there is a fixed direction between the sound source and the microphone, the sensitivity between the sound source and the microphone is required to be different in each direction. When the angle is 0°, the sensitivity of the microphone is high, and when it is 180°, the sensitivity of the microphone is low. At this time, it is enough to open a hole on the shell before and after the sound hole of the microphone. For example, car phone, etc.

3. The use of noise-cancelling microphone: When there is a fixed direction between the sound source and the microphone, and the sensitivity of the microphone in each direction is required to be different, the difference between the sound source and the microphone When the included angle is 0° and 180°, the sensitivity of the microphone is high, and 90° and 270° are low. At this time, it is enough to open a hole on the shell before and after the sound hole of the microphone. For example, car phone, etc.

4. Under the same other conditions, the sensitivity of the omnidirectional microphone is high, the sensitivity of the unidirectional microphone is lower, about 6-8dB lower than that of the omnidirectional microphone, and the sensitivity of the noise canceling microphone is lower, about Lower the microphone head by about 10--12dB.